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Hello. My name is Tan.
Could I get the engine make, model and serial number please?
Did you check the fuel filter in the fuel pump and the carburetor?
If yes then we need to run the engine on another fuel source like as gas can.
Have you run the engine on a different fuel source?
Ok have you done a drop cylinder test and a compression test? Have you done a fuel pump pressure test?
Drop cylinder test is where you put the engine in gear give it a little rpms and pull each plug wire off at the distributor cap one at a time. It should drop rpms on each cylinder.